Someone who is highly respected or famous owing to their deep knowledge of an academic subject or influence in society.
When a heavyweight writes, speaks or comments on their subject, people listed, record, share and Tweet their views.

My dream seminar would be chaired by Steve Zaloga, Thomas Andersson, Simon Dunstan and Mikhail Bartinskiy because they are heavyweights on tank technology and history.

Ted- "yo blair, is it just me or do u feel really damn heavy all of a sudden?"
Blair- (laying on the floor) "are you kidding me!!! im getting pressed against the f*kin floor im so damn heavy."
Ted-"lmfao, they shuld call this shit heavyweight!!"